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Retirement Benefits (Obligations and Funded Status) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Change in benefit obligation:    
Defined Benefit Plan, Plan Assets, Divestiture $ 0 $ 0
Defined Benefit Plan, Benefit Obligation, Divestiture 0 0
Pension Benefits    
Change in benefit obligation:    
Defined Benefit Plan, Benefit Obligation 22 50
Service cost 0 0
Interest cost 1 2
Defined Benefit Plan, Benefit Obligation   22
Change in plan assets:    
Defined Benefit Plan, Plan Assets, Amount 20  
Defined Benefit Plan, Plan Assets, Amount 22 20
Amounts recognized in the consolidated balance sheets consist of:    
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position   (2)
Amounts recognized in accumulated other comprehensive income (pre-tax basis) consist of:    
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax   0
Other Postretirement Benefits    
Change in benefit obligation:    
Defined Benefit Plan, Benefit Obligation 148 195
Service cost 0 1
Interest cost 6 4
Benefits paid, net (13) (14)
Actuarial gain and other (3) (38)
Defined Benefit Plan, Benefit Obligation 138 148
Change in plan assets:    
Defined Benefit Plan, Plan Assets, Amount 259 311
Return on plan assets and other 29 (41)
Employer contributions 2 3
Benefits paid, net (13) (14)
Defined Benefit Plan, Plan Assets, Amount 277 259
Amount underfunded (overfunded) at end of period (139) (111)
Amounts recognized in the consolidated balance sheets consist of:    
Non-current assets 155 127
Current liabilities (2) (2)
Non-current liabilities (14) (14)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position 139 111
Amounts recognized in accumulated other comprehensive income (pre-tax basis) consist of:    
Net actuarial gain (loss) (12) 5
Prior service credit (3) (3)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax (15) 2
Funded Plans [Member] | Pension Benefits    
Change in benefit obligation:    
Defined Benefit Plan, Benefit Obligation 22  
Interest cost 1 1
Benefits paid, net (1) (1)
Actuarial gain and other 1 (8)
Defined Benefit Plan, Plan Assets, Divestiture 0 (20)
Defined Benefit Plan, Benefit Obligation, Divestiture 0 (20)
Defined Benefit Plan, Benefit Obligation 23 22
Change in plan assets:    
Defined Benefit Plan, Plan Assets, Amount 20 44
Return on plan assets and other 2 (4)
Employer contributions 1 1
Benefits paid, net (1) (1)
Defined Benefit Plan, Plan Assets, Amount 22 20
Amount underfunded (overfunded) at end of period 1 2
Amounts recognized in the consolidated balance sheets consist of:    
Non-current assets 0 0
Current liabilities 0 0
Non-current liabilities (1) (2)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position (1)  
Amounts recognized in accumulated other comprehensive income (pre-tax basis) consist of:    
Net actuarial gain (loss) 0 0
Prior service credit 0 0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax 0  
Unfunded Plans [Member]    
Change in benefit obligation:    
Defined Benefit Plan, Plan Assets, Divestiture 0 0
Defined Benefit Plan, Benefit Obligation, Divestiture 0 (2)
Unfunded Plans [Member] | Pension Benefits    
Change in benefit obligation:    
Defined Benefit Plan, Benefit Obligation 19 26
Service cost 0 0
Interest cost 1 1
Benefits paid, net (3) (3)
Actuarial gain and other 0 (3)
Defined Benefit Plan, Benefit Obligation 17 19
Change in plan assets:    
Defined Benefit Plan, Plan Assets, Amount 0 0
Return on plan assets and other 0 0
Employer contributions 0 0
Benefits paid, net 0 0
Defined Benefit Plan, Plan Assets, Amount 0 0
Amount underfunded (overfunded) at end of period 17 19
Amounts recognized in the consolidated balance sheets consist of:    
Non-current assets 0 0
Current liabilities (3) (3)
Non-current liabilities (14) (16)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position (17) (19)
Amounts recognized in accumulated other comprehensive income (pre-tax basis) consist of:    
Net actuarial gain (loss) (2) (2)
Prior service credit 0 0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax $ (2) $ (2)